i want add a new lighting system this summer to my tank and had a question. i currently have a single 250 watt MH with a 24 inch reflector so the light dispurses over the whole tank which is a 65 tall. my question is this: i am planning on adding another 250 MH. if i use two different bulbs on each side of the tank will it show up with two differnt color areas or will the color blend.